Blunt 120mm Gap Core Wheel - Gold/Black – Skate East
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Envy Gap Core Scooter Wheels 120mm Black/Jade
If you have skate grip, cut it so there are small gaps in a direction perpendicular to the direction you flick your fingers. It makes it much grippier and less abrasive. :
Obstacle Guide - What is a London Gap? | skatedeluxe Blog